Nonlinear microwave response of an MgB2 thin film

A. J. Purnell, L. F. Cohen, H. Y. Zhai, H. M. Christen, M. P. Paranthaman, D. H. Lowndes, Ling Hao, J. C. Gallop

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

MgB2 is a two-gap superconductor and as a result may manifest unusual physical properties. The performance of MgB2 films at microwave frequencies has so far been rather poor compared to that of Nb alloys and this may result from intrinsic behaviour related to the double-gap structure or extrinsic properties due to non-optimized thin films. Here we give a detailed report on the microwave magnetic field dependent surface impedance of an MgB2 thin film, using a parallel plate resonator, as a function of temperature. We discuss whether the framework used to analyse nonlinear behaviour for other superconductors, both low and high Tc, but single-gap, has any validity for MgB2 and whether the films are limited by intrinsic or extrinsic behaviour. The key result is the observation of junction-type switching effects at high microwave power.

Original languageEnglish
Pages (from-to)681-684
Number of pages4
JournalSuperconductor Science and Technology
Volume17
Issue number4
DOIs
StatePublished - Apr 2004

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